Improvement in processes of bronzing and flocking paper, cotton, lin



UNITED STATES PATENT OFFICE.

ROBERT E. PETERSON AND EDT/VARD J. FROST, OF PHILADELPHIA, PAQ

IMPROVEMENT IN PROCESSES 0F BRONZING'AND FLOCKING PAPER, COTTON, LINEN,8L0.

Specification forming part of Letters Patent No. 209,625, dated November5, 1878; application filed October 10, 1878.

tenacious substance in such manner as to re tain said bronze or otherpowder where the same may come in contact therewith; and it consists inpassing the paper, cotton or linen cloth, or other fabric, the surfaceof which has been first properly sized or otherwise prepared to retainsaid bronze or other powder when brought into contact therewith, througha current of air charged with bronze or other powder, which is therebydriven against said prepared paper or other fabric, and by circulationand agitation brought into contact with every part of the surfaceintended to receive the same. p

In carrying out our invention, take a sheet of paper and size the same,or such portions thereof as it may be desired to bronze, with theordinary sizing in use among printers for such purposes, or any similarsubstance possessing the necessary retaining property, and by means of arotary cylinder made to revolve in an air-chamber constructed for thatpurpose, or by any similar means, pass the said paper, with its preparedsurface exposed to the action of a current of air within said chamber,by revolution of said cylinder into the same, and there bring the saidprepared surface into contact with the bronze or other powder intendedto be deposited thereon by means of a strong current of air charged withsaid bronze or other powder, and kept in constant circulation andagitation by means of pipes connecting with said air chamber, throughwhich, by means of proper machinery constructed for that purpose, theair is forced into said chamber and it will be found that the saidpaper, where sized, has received a full and equable charge of bronze orother powder, and that all those parts of the paper not intended to beso covered are left clean and unimpaired.

By this process the most elaborate and delicate designs of artisticprinting are executed without smudging or broadening the lines, as isthe case with the processes of bronzin g ordinarily in use, the sameforce of air which drives the bronze-powder into close adhesion with thesized portion of the surface acting with equal force upon the unsizedsurface to keepit clean and blow away all extraneous matter.

Hitherto bronzing, flocking, and other like operations in the printingbusiness have been done by means of brushes, pads, or by the hand, andgenerally by manual application; but bronzing-machines have beenconstructed to facilitate these operations, all, so far as we know,imitating these processes, the sized paper being brought into contactwith the surface of brushes or pads containing the bronze, the effect ofwhich is often to impair the beauty and regularity of the work bysmudging and broadening the lines thereof. It is to avoid this defect,and also to increase the facility with which brouzin g can be done, soas to keep pace, if possible, with other improvements in the printingbusiness, that we have invented the process herein described and amachine for carrying the same into effect; and its advantages over theprocesses now in vogue are very many, including among them, besidesthose above recited, rapidity of execution and economy of material andlabor.

We claim as our invention The process of bronzing, flocking, orotherwise powderin g paper or other fabric prepared by sizing or otherlike process to receive and retain said bronze or other powder bypassing the same through a chamber through which currents of air chargedwith bronze or other powder are kept in rapid circulation by means ofproper machinery provided for that purpose, substantially as described.

ROBERT EVANS PETERSON. EDWARD J. FROST. Witnesses:

J OHN B. PETERSON, JOSEPH I. STEWART.

